Hi
Currently for device-mapper devices, we initialize the mempool for requests
and elevator at device creation time. But only request-based devices use the
elevator and mempool. These patches change it to allocate the mempool and
initialize the elevator only for request-based devices. This is done by
allocating a queue at device creation time, but delaying the initialization of
elevator and allocation of mempool till the first table load time, when the
type of device would be known.
[PATCH 1/2] Allow delaying initialization of queue after allocation
[PATCH 2/2] Initialize mempool and elevator only for request-based dm devices
Another approach would be to free the mempool and detach elevator, if it would
be a bio-based device. But it is better to avoid initialization itself.
Thanks
Nikanth